Add scoped overlay hosts

src/widget/text/selection.rs

@@ -624,7 +624,7 @@ mod controller_tests {
         let found = rsc
             .events()
             .controllers
-            .nearest_id::<SelectionController>(leaf.id(), &render)
+            .nearest_id::<SelectionController>(leaf.id())
             .unwrap();
         assert_eq!(found.host(), inner.id());
     }